Q. Consider a motorboat directed upstream and observed to be at rest from the bank of a river. Which of the following statements is/are correct in this context?

1. The engine of the boat is doing work as per Physics.
2. If the engine stops, no work will be done.
3. If the engine stops, the boat will gain kinetic energy.

Select the correct option from the codes given below:
Answer: Only 1 & 3
Notes: Statement 1 is correct: the engine works against the river current. Statement 2 is incorrect: if the engine stops, the river does work on the boat. Statement 3 is correct: if the engine stops, the river imparts kinetic energy as the boat moves downstream. Therefore, only statements 1 and 3 are correct.